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6.Command Specification LOG SENSE
6-24 SONY AIT-3Ex drive SDX-800V series Ver.1.1
6.6.7. Tape Log Page (Sony Unique)
This page is a Sony unique page which provides information on the tape currently being used. This log cannot be
cleared and has the following format:
Table 6-21: Tape Log Page
Bit
Byte
7 6 5 4 3 2 1 0
0 Reserved Page Code (30h)
1 Reserved
2 (MSB) Page Length (98h)
3 (LSB)
4 (MSB) Parameter Code
5
6 DU (0) DS (1) TSD (0) ETC (0) TMC (00) LBIN (0) LP (0)
7 Parameter Length (m)
8 Parameter Value
3+m
This page is used to return Tape Log information to the host in a format which conforms to the LOG SENSE
command page format.
Supported Parameter Codes in this page are listed below along with their meanings:
Table 6-22: Tape Log parameter codes
Parameter Code Description Length
001h
002h
003h
004h
005h
006h
007h
008h
009h
00Ah
00Bh
00Ch
00Dh
Current Groups Written
Current Rewritten Tracks
Current Groups Read
Current C3 ECC Count
Previous Groups Written
Previous Rewritten Tracks
Previous Groups Read
Previous C3 ECC Count
Total Groups Written
Total Rewritten Tracks
Total Groups Read
Total C3 ECC Count
Load Count
8
8
8
8
8
8
8
8
8
8
8
8
4
This information is contained within RAM in the Drive Controller. The log is updated as the tape is used.
The term 'current' refers to information generated during the current load of the tape; 'previous' refers to information
generated during the last tape load; 'total' refers to information generated during the life of the tape since it was first
initialized including the current load.
Use: An estimate of reading and writing performance can be made by the ratios of 'Total Groups Written' to
'Rewritten Tracks' and 'Groups Read' to 'C3 ECC Count'. An indication of tape degradation can be gained by
comparing these ratios for 'current', 'previous' and 'total' entries.
Any attempt to change this page using LOG SELECT will result in a CHECK CONDITION with a Sense Key of
ILLEGAL REQUEST. The current cumulative values will be returned regardless of the Page Control field in the LOG
SENSE CDB.